99 spec turbo dyno results
09-04-03, 11:17 PM
#1
99 spec turbo dyno results
I finally got some time to tune the PFC and see the HP of the 99 spec turbos (280 hp model). Ambient dyno temp was 82F. Boost was set for 1.00 psi/kg on the PFC and that was what I hit on the second turbo .99 to 1.00 to redline. So that breaks down to 14.22 psi for the run, which I verified from the logged run comparing my PIM voltage in the manual.
With an A/F ratio from 5000 rpms to 6300 in the 11.2 range, then from there to redline it varies from 11.0 to 11.5 but never any leaner until I let off near redline.
Max hp at 14.22 psi was 362.9 rwhp
Max torque was 320.5 ft/lbs to the wheels.
Of note, the primary turbo did indeed spool up quicker, but ran out of breath as well, when compared to stock 93-95 turbos. At 3200 rpms, I had 270 ft/lbs of torque compared to 248ish with the stockers at the point. But nearing transition, the 99 turbos dropped below the 93-95 around 3700 rpms and at transition it was a good 20 ft/lbs below the 93-95 turbos. Although with some more tuning, I can hopefully bring that up a alittle since I was 11.0 to 10.7 in that range where the 93 to 95 were making more hp.
Tim
With an A/F ratio from 5000 rpms to 6300 in the 11.2 range, then from there to redline it varies from 11.0 to 11.5 but never any leaner until I let off near redline.
Max hp at 14.22 psi was 362.9 rwhp
Max torque was 320.5 ft/lbs to the wheels.
Of note, the primary turbo did indeed spool up quicker, but ran out of breath as well, when compared to stock 93-95 turbos. At 3200 rpms, I had 270 ft/lbs of torque compared to 248ish with the stockers at the point. But nearing transition, the 99 turbos dropped below the 93-95 around 3700 rpms and at transition it was a good 20 ft/lbs below the 93-95 turbos. Although with some more tuning, I can hopefully bring that up a alittle since I was 11.0 to 10.7 in that range where the 93 to 95 were making more hp.
Tim
09-04-03, 11:21 PM
#2
list of mods:
stock engine- no porting, 99 turbos, M2 intake, efini-y pipe, M2 med IC, Ceramic coated DP, resonated MP, PFS cat-back, PFC, 1200 secondaries, 9's in all 4 plugs, 11.5 lbs flywheel, underdrive pulley, HKS twin ignition, ground wires (smoother idle, can't tell about HP gains with it), thats about all I can think of that might make a difference.
Tim
stock engine- no porting, 99 turbos, M2 intake, efini-y pipe, M2 med IC, Ceramic coated DP, resonated MP, PFS cat-back, PFC, 1200 secondaries, 9's in all 4 plugs, 11.5 lbs flywheel, underdrive pulley, HKS twin ignition, ground wires (smoother idle, can't tell about HP gains with it), thats about all I can think of that might make a difference.
Tim
09-04-03, 11:29 PM
#4
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Nice! 
Will you run @ 15lbs since you have the fuel mod's?
Did power drop off at 7500 or higher?
Is there any difference in the manifold or is it just the turbos themselves that was improved?
Will you run @ 15lbs since you have the fuel mod's?
Did power drop off at 7500 or higher?
Is there any difference in the manifold or is it just the turbos themselves that was improved?
09-04-03, 11:50 PM
#7
Eats, Sleeps, Dreams Rotary
Tim great to hear!!
Congrats!! makes me excited to get my car back and the 99's put on...
BTW, what do you think the cause of the drop off on the primary turbo is caused by? Turbo design?
Congrats!! makes me excited to get my car back and the 99's put on...
BTW, what do you think the cause of the drop off on the primary turbo is caused by? Turbo design?
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09-05-03, 02:31 AM
#8
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Nice numbers, Tim! Just to be a stick-in-the-mud, I'll ask whether those numbers are "actual" or sae corrected?
Please post a scan of your dyno or datalog run. Is your torque falling off from 3700-4500? On all my dyno runs, the torque is flat as Kansas from 2800 to ~4500 where there's the infamous dip and then spike at transition.
What's your transition look like? Is it possible (on your car) to feed slightly less boost to the pre-control to maintain full primary boost until transition (assuming your boost IS dropping off)?
Please post a scan of your dyno or datalog run. Is your torque falling off from 3700-4500? On all my dyno runs, the torque is flat as Kansas from 2800 to ~4500 where there's the infamous dip and then spike at transition.
What's your transition look like? Is it possible (on your car) to feed slightly less boost to the pre-control to maintain full primary boost until transition (assuming your boost IS dropping off)?
Last edited by rynberg; 09-05-03 at 02:35 AM.
09-05-03, 05:42 AM
#9
The 362.9 number is SAE corrected. I had him do it in STD, like some do for a higher number and amazingly, I was up to 369. We did a couple of my old dyno runs and STD tends to be 5 to 6 hp higher.
7racer, the primary is 2mm smaller, but also has a differing blade design than the 93-95. I'll go through the log when I have time today and see what the primary turbo was holding boost at from 3.5 to 4500.
From 6200 to redline, I'm at 350 to the wheels, which felt great on the ride home. The first run of the night netted 337, 4 runs later, at the same boost level, we were up to the 363 number , with knock values under 25 so a few more HP can be found with timing. I went to the dyno to just do the 3 pulls and leave, but since there wasn't anyone at the dyno, the owner let me hook up the wideband and do some tuning with time inbetween the runs to cool it off. I wasn't planning on really tuning it since he's normally pretty busy on Thursday nights, I guess I got lucky.
Tim
7racer, the primary is 2mm smaller, but also has a differing blade design than the 93-95. I'll go through the log when I have time today and see what the primary turbo was holding boost at from 3.5 to 4500.
From 6200 to redline, I'm at 350 to the wheels, which felt great on the ride home. The first run of the night netted 337, 4 runs later, at the same boost level, we were up to the 363 number , with knock values under 25 so a few more HP can be found with timing. I went to the dyno to just do the 3 pulls and leave, but since there wasn't anyone at the dyno, the owner let me hook up the wideband and do some tuning with time inbetween the runs to cool it off. I wasn't planning on really tuning it since he's normally pretty busy on Thursday nights, I guess I got lucky.
Tim
09-05-03, 05:44 AM
#10
Rynberg,
About the torque on the primary, my old turbos were the same as yours, with a flat torque curve from 3200 to the 4400 transition area (250 ft/lbs). I'll check the log data to see the boost level on the 99s through the range as well.
Tim
About the torque on the primary, my old turbos were the same as yours, with a flat torque curve from 3200 to the 4400 transition area (250 ft/lbs). I'll check the log data to see the boost level on the 99s through the range as well.
Tim
09-05-03, 06:48 AM
#11
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looks like good tuning Tim.
As for the torque fall off. Sounds to me like you just need to use the datalogit to change the transition point to at lower RPM. If the primary is running out of breath bring in the secondary sooner. Afterall there's no gain in just leaving it sitting prespooled.
As for the torque fall off. Sounds to me like you just need to use the datalogit to change the transition point to at lower RPM. If the primary is running out of breath bring in the secondary sooner. Afterall there's no gain in just leaving it sitting prespooled.
09-05-03, 10:30 AM
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So does this mean you wont be getting Steve to tune your car with the Datalogit? hehe
Well, regaurdless your numbers look nice. Even if you dont get Steve to play with it you should come that weekend and hang out. I was so busy at the cookout I didnt really get a chance to talk to people much....kinda sucked
STEPHEN
Well, regaurdless your numbers look nice. Even if you dont get Steve to play with it you should come that weekend and hang out. I was so busy at the cookout I didnt really get a chance to talk to people much....kinda sucked
STEPHEN
09-05-03, 11:47 AM
#16
2/4 wheel cornering fiend
Originally posted by turbojeff
Do you have any pics of your M2 IC with Efini y-pipe?
Do you have any pics of your M2 IC with Efini y-pipe?
I'm interested on a pic of your Efini/M2 med SMIC setup as well, as I'm considering it.
Oh yeah, great numbers, Tim. Congrats.
09-05-03, 12:08 PM
#18
Originally posted by Kento
Hope this works, don't know how to pull an attached photo from a post: https://www.rx7club.com/forum/attach...&postid=830712
I'm interested on a pic of your Efini/M2 med SMIC setup as well, as I'm considering it.
Oh yeah, great numbers, Tim. Congrats.
Hope this works, don't know how to pull an attached photo from a post: https://www.rx7club.com/forum/attach...&postid=830712
I'm interested on a pic of your Efini/M2 med SMIC setup as well, as I'm considering it.
Oh yeah, great numbers, Tim. Congrats.
I have a M2 med IC and I was really wondering how he'd get the pipe bent over from the y-pipe to the IC inlet. There isn't really any room.
Jeff
09-05-03, 12:31 PM
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Re: sequential?
Originally posted by Meatball529
would going sequetial take car of the flat line? or do you not want to go that path?
would going sequetial take car of the flat line? or do you not want to go that path?
Tim IS running sequential. What do you mean by "flat line"? A flat, wide torque curve is a good thing....
09-05-03, 01:15 PM
#21
2/4 wheel cornering fiend
Originally posted by turbojeff
That isn't a M2 med IC. If I had to guess I'd say it is a CWC.
I have a M2 med IC and I was really wondering how he'd get the pipe bent over from the y-pipe to the IC inlet. There isn't really any room.
Jeff
That isn't a M2 med IC. If I had to guess I'd say it is a CWC.
I have a M2 med IC and I was really wondering how he'd get the pipe bent over from the y-pipe to the IC inlet. There isn't really any room.
Jeff
So does it really look tough to do? Reason being I was interested in getting an M2 medium, but I have an Efini y-pipe.
09-05-03, 02:36 PM
#23
2/4 wheel cornering fiend
A thought, Jeff: does the M2 medium have any sort of attachment to the body, other than the intake piping? Since I bought one of your "small" battery trays 
, is it possible to move the M2 med SMIC over slightly to the right, closer to the battery? Would that help any with intake pipe routing?
, is it possible to move the M2 med SMIC over slightly to the right, closer to the battery? Would that help any with intake pipe routing?
09-05-03, 04:02 PM
#25
I'll scan in the sheet tonight and post it, along with some more info from the logged runs.
As far as how I made the efini y pipe fit with the M2 Med IC. I had to take the trusty dremel out and cut the top of the efini-y pipe lower section but still leave enough room for the 2 hose fittings on back. So I'm back to the old hose and clamp setup, but I never had a problem with that before or now. I did have to notch out the hood support that was rubbing the IC inlet pipe that comes with the M2 med IC, It's as far down as it can go and it still rubbed.
I think I'll take it up to 16 psi next time and I think the 99s will make around 380 MAX, if not a little lower to be on the safe side. The transition point currently on the dyno plot, where the graph shoots upward after the secondary comes on line is 4400 rpms. I'll work with the area from 3200 to 4400 and see if it helps any, if not I might try to make the transition come on around 4200.
BTW, the PFC reads in kg/cm2 for boost, unlike what I typed up top at the thread start. 1.0 kg/cm2 = 14.22 psi, just correcting the info above where I wrote psi/kg by mistake.
Tim
As far as how I made the efini y pipe fit with the M2 Med IC. I had to take the trusty dremel out and cut the top of the efini-y pipe lower section but still leave enough room for the 2 hose fittings on back. So I'm back to the old hose and clamp setup, but I never had a problem with that before or now. I did have to notch out the hood support that was rubbing the IC inlet pipe that comes with the M2 med IC, It's as far down as it can go and it still rubbed.
I think I'll take it up to 16 psi next time and I think the 99s will make around 380 MAX, if not a little lower to be on the safe side. The transition point currently on the dyno plot, where the graph shoots upward after the secondary comes on line is 4400 rpms. I'll work with the area from 3200 to 4400 and see if it helps any, if not I might try to make the transition come on around 4200.
BTW, the PFC reads in kg/cm2 for boost, unlike what I typed up top at the thread start. 1.0 kg/cm2 = 14.22 psi, just correcting the info above where I wrote psi/kg by mistake.
Tim